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Holman J.B.F
10-03-2007, 01:19 PM
Where to tap hot water for a heater on a LY6 engine?
there are 2 rubber drain hoses near the knock sensors.
Wouldn,t it be better to tap water somewhere on top of the engine?

Ole Miss Rebels
10-03-2007, 02:01 PM
from what i've heard the heaters don't work well at all with an ly6. not sure why but there have been some issues with that. that being said i am interested to know if mc fixed the proble,m because i am fixing to order a new boat with ly6 and i definitely want a functional heater. let's hope we both get a good answer.

Andyg
10-03-2007, 02:57 PM
The stock heat is run from the thermostat housing. The heater in my 2008 197 with the LY6 is pretty much useless once the water temp gets into the 60s.

Holman J.B.F
10-03-2007, 09:26 PM
my temp gauge reads only 65celcius (149 F)my aftermarket heater is blowing some hot air but By far not as hot as the Bu Vlx did with the same heater.I put an T on the 2 drainhoses and go back thru an Y pipe from heatercraft just before the raw water pump.
Would a higher rated thermostat work?I don,t want to damage the engine or run it to hot.My problem isn,t the heater i could live with that,the engine needs a good +/-175 f temp for a succesfull propane conversion.Today i filled the x-star up...380$..DAM*** we had 3 short rides and the fuel mtr showed 68%..(with ballast)I need the LPG conversion YESTERDAY!...So If anybody has some info about the coolant temp on a LY6..please help.

BrianM
10-03-2007, 09:56 PM
I would think it would be no problem to run a warmer 170ish t-stat. The 6.0 in the trucks runs 210.

MYMC
10-04-2007, 10:26 AM
Due to the nature of the plumbing & direction of water flow there is not much currently that can be done...I am told a fix is in the works but I have not seen it yet.

Holman J.B.F
10-06-2007, 06:30 PM
we checked the water temp and it reads 159f temp is good but it seems there is not enough waterflow thru the heater.i,m planning to drill the 5 mm hole a little big bigger on he return Y-pipe from heater craft.My guess is the flow will increase a little by the suction of the raw waterpump..To bad i have to wait untill march...:(

Holman J.B.F
10-11-2007, 04:00 PM
guys i could really use some help here,..if anyone is familiar with the LY 6 waterflow please help.
I do not need it for the heater but the lpg converter needs to be hot.
If anyone has a waterflow diagram of the LY6 that might be helpfull too.

here are some pics of the thermostat housing,
http://members.chello.nl/j.holman/thermostaat%20huis.jpg

is the short hose like a bypass on the old 7.4 ltr enigines?
http://members.chello.nl/j.holman/thermostaat%20huis2.jpg
http://members.chello.nl/j.holman/thermostaat%20hui3s.jpg

what if i T into the watertemp sensor hole?...there is another on the other side of the heads.join them and return to the Y-Pipe?
http://members.chello.nl/j.holman/thermostaat%20hui4s.jpg

sand2snow22
10-11-2007, 05:08 PM
PM Dr. Brainey, he'll know! I wouldn't mess with it and I would get a heated seat.....

MYMC
10-11-2007, 05:08 PM
guys i could really use some help here,..if anyone is familiar with the LY 6 waterflow please help.
I do not need it for the heater but the lpg converter needs to be hot.
If anyone has a waterflow diagram of the LY6 that might be helpfull too.

here are some pics of the thermostat housing,
http://members.chello.nl/j.holman/thermostaat%20huis.jpg

is the short hose like a bypass on the old 7.4 ltr enigines?
http://members.chello.nl/j.holman/thermostaat%20huis2.jpg
http://members.chello.nl/j.holman/thermostaat%20hui3s.jpg

what if i T into the watertemp sensor hole?...there is another on the other side of the heads.join them and return to the Y-Pipe?
http://members.chello.nl/j.holman/thermostaat%20hui4s.jpg
What temp does the LPG heater need to be?

Holman J.B.F
10-11-2007, 05:48 PM
160 should be ok,...a bit more would be better but then i would have to install a different thermostat.
p.s it is not a lpg heater..it is called a converter but basicly if it works fo the heater then lpg converter will be just fine.

MYMC
10-11-2007, 06:09 PM
Currently depending on lake temps there is no place on the engine where you will see this temp consistantly, not what you want to hear but true. The heater is cut in the "U" hose that you have pictured in photo #2 (highlighted).

Caution LY6's can have issues overheating (at idle & running) when equipped with heaters (leading to more issues), some believe is directly related to the heater install (factory or not). My current opinion is that the heater has nothing to do with it but that is a story for another day. You have the info you need...good luck!

Engine Nut
10-11-2007, 07:00 PM
160 should be ok,...a bit more would be better but then i would have to install a different thermostat.
p.s it is not a lpg heater..it is called a converter but basicly if it works fo the heater then lpg converter will be just fine.

Here is a water flow diagram for the LY6.

Eagle Lake Rebel
10-11-2007, 10:42 PM
I've got an LY6 without the heater and have had no temp problems at all. The temp stays at 160 on the gauge just like my MCX did. My boat was built in May which I think by then some mods were made (water to packing) compaired to the early LY6's for '07.

MYMC
10-12-2007, 10:30 AM
I've got an LY6 without the heater and have had no temp problems at all. The temp stays at 160 on the gauge just like my MCX did. My boat was built in May which I think by then some mods were made (water to packing) compaired to the early LY6's for '07.
The issues have nothing to do with the water to the dripless seal or when the boat was produced.

Holman J.B.F
10-13-2007, 05:26 PM
i took the thermostat housing from the engine to take a look inside and study the route of the flow.I,m still a bit confused.
Option 1 tapping from the small fitting at the circulation pump and block Or reduce the right one.return thru the Y-pipe from heatercraft.

option 2 Tap from the big hose comming from the circulation pump?

option 3 try the original way,..the flow has to travel only 2 feet and return?


I need my propane conversion so bad,hot water is necesarry.

some pics of the thermostat housing etc

http://members.chello.nl/j.holman/therm%201.jpg
http://members.chello.nl/j.holman/therm%202.jpg
http://members.chello.nl/j.holman/therm%203.jpg
http://members.chello.nl/j.holman/therm%204.jpg

Holman J.B.F
10-13-2007, 05:27 PM
http://members.chello.nl/j.holman/therm%205.jpg

Eagle Lake Rebel
10-15-2007, 10:23 PM
Not that this will fix the heater problem, but there is a service bulletin on SN 130833 and prior LY6's that did require cooling mods to be made. Bulletin # 2006.AUG30.SB-005 Subject LY6 raw water cooling system. Mod included dripless packing relocator kit. Hope MC or Indmar finds a fix for you soon.

Holman J.B.F
02-09-2008, 05:21 PM
Boat runs perfect...!!!it even revs a 100rpm more on lpg on w.o.t
converters stay hot all the time,...no powerloss what so ever.I,m very happy.slammed the boat down with 3500lbs and schoots out of the hole.
(i have driven a lot of tournaments in different boats so i know how to compare)
my heater is not giving much heat at all,but it could have an air bubble trapped inside.There is a flow because the converters a in series with the heater.
River temp was 43.
Does anybody have some info about those LY6 overheating isseus?
mine is only 130 when idling and goes up to 160 at wakeboard speeds.

snork
02-10-2008, 10:50 AM
I'm interested in your lp conversion. Where do you store the lp?
Who is the conversion company? Big expense?

Holman J.B.F
02-10-2008, 03:45 PM
as a ski/boat service company i,m doing a lot of lpg conversions.The LY6 was a challenge but it runs perfect.
here are some metric nrs.
the lpg is stored in 4 steel lpg bottles(not the camping gas type!!)wich hold +/- 33 ltr each,the tanks are in the rear compartment. 2 on each side.They are 30cm width and 70cm long.They weight about 35 kilo each when full.You can take them out of the boat and fill at a gas station.

Cost for a complete conversion aprox 3500 euro,s the boat will run on gasoline and lpg.With european gasprices it will save the boatowner +/- 25 to 30 euro each hour of use,depending how much ballast is used.
A simple fact...lpg is 1 euro cheaper per liter than gasoline.
So a break even point is reached after about 110 hours.The boat will have a better resale value if it is equiped with a LPG conversion.
(at least in europe)

mmichelm
04-11-2010, 07:46 AM
I have a 2008 Indmar Ly6 and it is not cooling--any ideas on what I should look at first? The boat has a heater and a shower. I just bought it and it has 218 hrs

Holman J.B.F
04-11-2010, 03:11 PM
0...Is your ball valve open?
1....impellor
2...check your oil cooler(incomming side) for debris it might be clogged (in case you do not have a strainer,if so check the strainer)
3....thermostat
4... check the valve on the shower.(you have a red and blue hose one of them has a valve,can,t remember wich one)

5 air pocket inside the heatercore/blocked heatercore.